Power Plant Engineering Mcq Questions Pdf

21. In a regenerative surface condenser

(a) there is no pump to remove condensate and the condensate gets removed by gravity.
(b) there is only one pump for removing air and condensate.
(c) there are two pumps to remove air and condensate.
(d) there are three pumps to remove air, condensate and vapor.

22. In a surface condenser, on removal of air

(a) absolute pressure of condenser is reduced.
(b) absolute pressure of condenser is increased.
(c) absolute pressure of condenser remains unaffected.
(d) temperature of condensed steam is increased.

23. The purpose of the boiler feed pump is to

(a) pump hot air into the boiler.
(b) pump pulverized coal into the boiler.
(c) pump out steam from the boiler.
(d) pump water into the boiler.
(e) none of the above.

24. The function of air pumps in a condenser is to

(a) remove water.
(b) air leaking into the condenser and maintain vacuum.
(c) maintain atmospheric pressure in the condenser.
(d) both (a) and (b).

25. Wet air pump is to remove

(a) condensate only.
(b) air only.
(c) both air and condensate.
(d) vapor from the condenser.

26. In a steam power plant cooling towers are used for

(a) cooling condenser outlet water.
(b) cooling exhaust steam.
(c) cooling feed water.
(d) all of the above.

27. Spray ponds are used for cooling warm water coming out of condenser in

(a) large power plants.
(b) medium power plants.
(c) small power plants.
(d) both in medium and large power plants.

28. The drawback (s) of spray ponds is /are

(a) large ground area is required especially in case of large sized power plants.
(b) loss of water due to evaporation.
(c) considerable quantity of water is carried away in air when its velocity is high.
(d) all of the above.

29. In which of the following steam turbines the back pressure will be below the atmospheric one ?

(a) Non-condensing turbine.
(b) Condensing turbine.
(c) Topping turbine.
(d) None of the above.

30. The modern steam turbines are

(a) reaction turbines.
(b) impulse turbines.
(c) impulse reaction turbines.
(d) none of the above.

31. In case of reaction steam turbine

(a) there is a enthalpy drop both in fixed and moving blades.
(b) there is enthalpy drop only in moving blades.
(c) there is enthalpy drop only in fixed blades.
(d) none of the above.

32. As compared to steam at entry to the turbine which of the follow-ing will be larger at exit ?

(a) Flow rate.
(b) Pressure .
(c) Specific volume.
(d) Specific enthalpy.

34. For the same power, the size of a turbine

(a) increases with speed.
(b) remains with speed.
(c) decrease with speed.

35. The pressure on the two sides of the impulse wheel of a steam turbine

(a) is different.
(b) is the same.
(c) reduces from one side to the other side.
(d) increases form one side to the other side.

36. Reheat factor in steam turbines depends on

(a) stage efficiency.
(b) exit pressure.
(c) initial pressure and temperature.
(d) all of the above.

37. In steam turbines, the reheat factor

(a) increases with the increase in number of stages.
(b) reduces with the increase in number of stages.
(c) remains the same irrespective of number of stages.
(d) none of the above.

38. The value of reheat factor for a multistage steam turbine lies in the range of

(a) 1.005 to 1.03
(b) 1.01 to 1.06
(c) 1.02 to 1.1
(d) 1.10 to 1.2

39. Steam turbines are governed by

(a) nozzle control governing.
(b) throttle governing.
(c) bypass governing.
(d) all of the above.

40. Topping turbines are

(a) low pressure condensing ones.
(b) high pressure condensing ones.
(c) high pressure non-condensing ones.
(d) low pressure non-condensing ones.